If anyone is stuck on the thief portion, try speaking with Miss Taiga at night in the classroom on the left, she will tell you about a teacher, who you can talk to the principle about, and after that you can talk to Eve who will provide more info.
Bro you are the best
I did that, but I still get stuck on "Talk to Ms. Taiga" but I never have anything to say to Ms. Taiga.